Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Allowance for credit losses, finance receivables
Beginning balance	$ 314	$ 334	$ 321	$ 357
Charge-offs	(72)	(60)	(151)	(137)
Recoveries	32	35	64	74
Provision for credit losses	57	17	106	33
Other	4	1	(5)	0
Ending balance	314	334	321	357	$ 335	$ 321	$ 327
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance					316		304
Specific impairment allowance					19		23
Ending balance	314	334	321	357	335	321	327
Analysis of ending balance of finance receivables
Collectively evaluated for impairment					89,372		86,456
Specifically evaluated for impairment					506		589
Financing Receivables					89,878	87,236	87,045
Ending balance, net of allowance for credit losses					89,543	86,915	86,718
Allowance for credit losses, net investment in operating leases
Beginning balance	41	24	38	23
Charge-offs	(26)	(26)	(56)	(54)
Recoveries	16	18	31	32
Other	(1)	0	(1)	0
Ending balance	41	24	38	23	45	38	26
Analysis of Ending Balance of Allowance for Credit Losses, Net Investment in Operating Leases [Abstract]
Collective impairment allowance					45		26
Specific impairment allowance					0		0
Ending balance	41	24	38	23	45	38	26
Analysis of ending balance of net investment in operating leases
Collectively evaluated for impairment					23,428		19,901
Individually evaluated for impairment					0		0
Net investment in operating leases before allowance for credit losses					23,428	21,556	19,901
Ending balance, net investment in operating leases					23,383	21,518	19,875
Total allowance
Beginning balance	355	358	359	380
Charge-offs	(98)	(86)	(207)	(191)
Recoveries	48	53	95	106
Provision for credit losses	72	27	139	58
Other	3	1	(6)	0
Ending balance	355	358	359	380	380	359	353
Analysis of Ending Balance of Finance Receivables and Net Investment in Operating Leases [Abstract]
Collective impairment allowance					361		330
Specific impairment allowance					19		23
Ending balance	355	358	359	380	380	359	353
Net Investment in Operating Leases [Member]
Allowance for credit losses, finance receivables
Provision for credit losses	15	10	33	25
Consumer Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	301	307	305	327
Charge-offs	(70)	(57)	(150)	(132)
Recoveries	31	34	61	68
Provision for credit losses	57	17	110	40
Other	3	2	(4)	0
Ending balance	301	307	305	327	322	305	303
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance					303		281
Specific impairment allowance					19		22
Ending balance	301	307	305	327	322	305	303
Analysis of ending balance of finance receivables
Collectively evaluated for impairment					55,527		51,505
Specifically evaluated for impairment					380		419
Financing Receivables					55,907		51,924
Ending balance, net of allowance for credit losses					55,585		51,621
Commercial Portfolio Segment [Member]
Allowance for credit losses, finance receivables
Beginning balance	13	27	16	30
Charge-offs	(2)	(3)	(1)	(5)
Recoveries	1	1	3	6
Provision for credit losses	0	0	(4)	(7)
Other	1	(1)	(1)	0
Ending balance	13	27	16	30	13	16	24
Analysis of ending balance of allowance for credit losses, finance receivables
Collective impairment allowance					13		23
Specific impairment allowance					0		1
Ending balance	$ 13	$ 27	$ 16	$ 30	13	$ 16	24
Analysis of ending balance of finance receivables
Collectively evaluated for impairment					33,845		34,951
Specifically evaluated for impairment					126		170
Financing Receivables					33,971		35,121
Ending balance, net of allowance for credit losses					$ 33,958		$ 35,097